CN107370407A - A kind of quick determination method and system of current source type static frequency changer inverter bridge commutation failure - Google Patents
A kind of quick determination method and system of current source type static frequency changer inverter bridge commutation failure Download PDFInfo
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- CN107370407A CN107370407A CN201710630146.8A CN201710630146A CN107370407A CN 107370407 A CN107370407 A CN 107370407A CN 201710630146 A CN201710630146 A CN 201710630146A CN 107370407 A CN107370407 A CN 107370407A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of quick determination method of current source type static frequency changer inverter bridge commutation failure, wherein the pulse-triggered state of inverter bridge in current source type static frequency changer control system is read, and identify should turning on for IGCT, answer off state, simultaneously by A, B, C three-phase currents have stream, without stream, positive half cycle conducting, negative half period turns on, electric current rises, the states such as electric current decline are identified, finally should turn on to IGCT, answer off state and three-phase current turns on and variable condition carries out comprehensive descision, when should turning on for IGCT, when answering off state with actual current lead-through and inconsistent variable condition, think commutation failure occur.Commutation failure caused by situations such as present invention can lead to again after effective detection goes out trigger pulse loss, IGCT turns off, and frequency is applied widely, can meet the commutation failure detection of static frequency changer 3~65Hz scopes.
Description
Technical field
This patent is related to the static frequency-conversion field of power system, and in particular to Large-scale machine set variable frequency starting, converting operation institute
The inverter bridge commutation failure detection method of the current source type variable frequency device used.
Background technology
Because of large-scale phase modifier in extra-high voltage alternating current-direct current serial-parallel power grid with very strong voltage stable state and dynamic reactive support work
With water-storage and gas turbine group have the effects such as very strong peak load shifting, emergency duty, new energy consumption, institute in power network
With large-scale phase modifier, pump-storage generator, gas turbine unit etc. in power network by it is lasting, quick, develop in a healthy way.Current source type
Static frequency changer is the preferred starting device of large-scale phase modifier unit, pump-storage generator, gas turbine unit, and in these necks
Domain extensive use.Startup success rate of the power network to these units requires very high, usually requires that more than 99.9%, and current source
The most common failure of type static frequency changer is exactly to be led directly to caused by inverter bridge commutation failure, if solving opening of bringing of commutation failure
Dynamic failure, this will greatly improve the success rate of static frequency changer startup.So fast and accurately detect that the commutation of inverter bridge is lost
Lose and be particularly important.
The content of the invention
Goal of the invention：Start success rate for unit frequency-conversion and require high, and commutation failure is to restrict to start success rate
One key factor, by providing a kind of detection side of fast and accurately current source type static frequency changer inverter bridge commutation failure
Method, to significantly improve the startup success rate of unit.
Meanwhile present invention also offers a kind of quick detection system of current source type static frequency changer inverter bridge commutation failure
System.
In order to achieve the above object, the technical scheme of quick determination method use is in the present invention：
A kind of quick determination method of current source type static frequency changer inverter bridge commutation failure, comprises the following steps：
(1) phase counter, is locked by real time contrast's IGBT group time and FPGA, obtains IGCT in real time
Triggering state, after obtaining triggering state, triggering state recycled in the same direction, and then acquisition IGCT answers conducting state
Or answer off state；
(2), obtain by the forward direction of each split-phase in the three-phase electricity of IGCT have stream, it is positive without flow, negative sense has stream, negative sense without
Stream, electric current reduce, the state of electric current increase；
(3), IGCT should turn on, answer off state, if now IGCT is in and answers conducting state, judge current crystalline substance
Direction corresponding to brake tube is without stream, and there is stream in direction corresponding to two-phase in addition, and delay judgement goes out commutation failure；
(4), by should the turning on of the IGCT that obtains in step (1), answer off state, if now IGCT is in and should closed
Disconnected state, and judge that separate electric current diminishes corresponding to current IGCT by step (2), while an other corresponding Tongfang
To electric current become big, and the equidirectional electric current and unchanged corresponding with other one of corresponding separate electric current is then delayed and sentenced
Break and commutation failure.
Beneficial effect, the quick detection side of current source type static frequency changer inverter bridge commutation failure proposed by the invention
Method, there is following obvious advantage：
1) IGCT should turn on, answer off state to be all based on the realization of FPGA programs, and real-time is very strong, during DSP is quick
It is disconnected timely and accurately to obtain the information, laid a good foundation for the quick detection of commutation failure.
2) current status of conducting thyristor are answered in the identification of pulse missing commutation failure without isolated differentiation, are also added into simultaneously
Current status corresponding to cutoff thyristor, and the current status of opposite direction conducting thyristor are treated, are tied in the differentiation of delay
System frequency has been closed, has carried out rational delay process, reliability greatly enhances.
3) shut-off leads to commutation failure identification and not only judges to answer the electric current of cutoff thyristor rebounding again, while also identification is newly opened
Logical thyristor current flows decline, and the changing value of the two is of substantially equal, through of short duration delay judgement, you can identify inverter bridge
Appearance turns off leads to commutation failure again, ensures that accuracy.
Preferably, in the step (2), by having stream setting value to compare with electric current, the three-phase electricity by IGCT is obtained
In Ia just have stream or just without stream, Ia bearing stream it is negative without stream, Ib just having stream or just without stream, Ib bearing stream or it is negative without stream, Ic just
There is stream or just bear stream without stream, Ic or bear without 6 states of stream；Simultaneously by the comparison with current variation value threshold, obtain Ia and become
Small, Ia becomes big, Ib diminishes, Ib becomes big, Ic diminishes, Ic becomes big 6 kinds of states；Wherein, Ia is by the A phase currents of IGCT, Ib
For by the B phase currents of IGCT, Ic is the C phase currents by IGCT.
Preferably, in step (3), judge that direction corresponding to the newest IGCT that need to be turned on does not have electric current, and need to turn off
IGCT then have stream, then it is assumed that pulse missing condition is set up, and with reference to the frequency of current inverter bridge, delay judgement goes out current brilliant lock
Pipe commutation failure caused by pulse missing.
Preferably, in step (3), with reference to the frequency operating range of inverter bridge, the pulse missing under current frequency is calculated
The delay judgement time, when pulse missing condition is set up, and elapsed time t delay, that is, think that pulse missing commutation failure occurs.
Preferably, in step (4), if separate electric current corresponding to current IGCT diminishes, at the same it is other one corresponding same
The electric current in direction becomes big, and the equidirectional electric current and unchanged corresponding with other one of corresponding separate electric current, then it is assumed that
Pulse missing condition, that is, turn off multiple gating condition and set up, with reference to the frequency operating range of inverter bridge, calculate the pass under current frequency
It is disconnected to lead to the delay judgement time again, if the multiple gating condition of shut-off is set up, and elapsed time t delay, that is, think that shut-off is led to commutation and lost again
Lose generation.
In order to achieve the above object, the technical scheme of rapid detection system use is in the present invention：
A kind of rapid detection system of current source type static frequency changer inverter bridge commutation failure, including：
Pulse-triggered state recognition module, to lock phase counter counts by real time contrast's IGBT group time and FPGA
Numerical value, the triggering state of IGCT is obtained in real time, after obtaining triggering state, triggering state is recycled in the same direction, and then
Obtain answering conducting state or answering off state for IGCT；
Current lead-through and variable condition detection module, the forward direction to obtain each split-phase in the three-phase electricity by IGCT have
Flow, the positive state for thering is stream, negative sense to increase without stream, electric current reduction, electric current without stream, negative sense；
Pulse missing commutation failure identification module, to answer conducting state by IGCT, judge current IGCT
Corresponding direction is without stream, and there is stream in direction corresponding to two-phase in addition, and delay judgement goes out commutation failure；
Commutation failure identification module is led in shut-off again, and off state is answered to be in by IGCT, and current IGCT pair
The separate electric current answered diminishes, while an other corresponding equidirectional electric current becomes big, and corresponding separate electric current and other one
Corresponding is equidirectional electric current and unchanged, and delay judgement goes out commutation failure.
Brief description of the drawings
Fig. 1 is current source type static frequency changer inverter bridge major loop.
Fig. 2 is IGCT VT1 pulse missing commutation failure recognition logic figures.
Fig. 3 is that commutation failure recognition logic figure is led in IGCT VT1 shut-offs again.
Embodiment
With reference to the major loop (accompanying drawing 1) of current source type static frequency changer inverter bridge, to the specific embodiment party of the present invention
Formula is described in detail.
1) pulse missing commutation failure logic, by taking IGCT VT1 as an example, (accompanying drawing 2).
1-1) VT1 pulse conditions identification module：FPGA programs issue VT1 trigger pulse, that is, have VT1 trigger pulses, this
When VT1 be in and answer conducting state, as FPGA programs issue VT3 or VT5 trigger pulse, i.e. VT3 or VT5 have trigger pulse, then
VT1 pulses are recovered, and now VT1 is in and answers off state.
1-2) VT1 pulse missings current detection module：According to just having stream threshold value, bearing stream threshold value, A, B, C are detected
Three-phase just has stream, bears stream mode, and Ia just is being born into stream, Ic without stream, Ib just had and the state such as flowing and deliver to VT1 pulse missings and sentence
Disconnected logic.
1-3) VT1 pulse missings condition judgment module：IGCT VT1 be in answer conducting state when, and Ia just without stream,
Ib bears stream, Ic just has stream, then it is assumed that VT1 pulse missings condition is set up.
1-4) be delayed computing module：With reference to inverter bridge 3-65Hz frequency operating range, the arteries and veins under current frequency is calculated
The delay judgement time is lost in punching, usually 1~12ms, and delay t is directly proportional to the inverter bridge cycle.
1-5) delay judgement module：VT1 pulse missings condition is set up, and elapsed time t delay, that is, thinks VT1 pulses
Lose commutation failure.
2) pulse-off leads to commutation failure logic, by taking IGCT VT1 as an example, (accompanying drawing 3) again.
2-1) VT1 pulse conditions identification module：FPGA programs issue VT1 trigger pulse, that is, have VT1 trigger pulses, this
When VT1 be in and answer conducting state, as FPGA programs issue VT3 or VT5 trigger pulse, i.e. VT3 or VT5 have trigger pulse, then
VT1 pulses are recovered, and now VT1 is in and answers off state.
2-2) the multiple galvanization detection module of VT1 shut-offs：According to just having stream threshold value, bearing stream threshold value, change threshold, examine
Measure the direction of A, B, C three-phase, have stream and a variable condition, and by Ia it is positive become big, Ib forward directions diminish, Ia+Ib is unchanged,
Ic bears the states such as stream and delivers to the multiple gating condition decision logic of VT1 shut-offs.
2-3) the multiple gating condition judge module of VT1 shut-offs：It is in IGCT VT1 and answers off state, and the positive changes of Ia is big, Ib
Forward direction diminishes, Ia+Ib is unchanged and Ic is to when having stream, then it is assumed that VT1 pulse missings condition is set up.
2-4) be delayed computing module：With reference to inverter bridge 3-65Hz frequency operating range, the pass under current frequency is calculated
Disconnected to lead to the delay judgement time again, usually 0.5~3ms, delay t are directly proportional to the inverter bridge cycle.
2-5) delay judgement module：The multiple gating condition of VT1 shut-offs is set up, and elapsed time t delay, that is, thinks that VT1 is turned off
Lead to commutation failure again.
It is described above be only by taking IGCT VT1 as an example, the detection of IGCT VT2~VT6 commutation failure have completely with
VT1 identical decision logics, will not be repeated here.
Claims (6)
1. a kind of quick determination method of current source type static frequency changer inverter bridge commutation failure, it is characterised in that including following
Step：
(1) phase counter, is locked by real time contrast's IGBT group time and FPGA, obtains the triggering of IGCT in real time
State, obtain triggering state after, triggering state is recycled in the same direction, so acquisition IGCT answer conducting state or
Answer off state；
(2), obtain by the forward direction of each split-phase in the three-phase electricity of IGCT have stream, it is positive without stream, negative sense have stream, negative sense without flow,
Electric current reduces, the state of electric current increase；
(3), IGCT should turn on, answer off state, if now IGCT is in and answers conducting state, judge current IGCT
Corresponding direction is without stream, and there is stream in direction corresponding to two-phase in addition, and delay judgement goes out commutation failure；
(4), by should the turning on of the IGCT that obtains in step (1), answer off state, if now IGCT is in and should turn off shape
State, and judge that separate electric current diminishes corresponding to current IGCT by step (2), at the same it is other one corresponding equidirectional
Electric current becomes big, and the equidirectional electric current and unchanged corresponding with other one of corresponding separate electric current, then delay judgement goes out
Commutation failure.
2. detection method as claimed in claim 1, it is characterised in that in the step (2), by having stream setting value with electric current
Compare, obtaining by the Ia in the three-phase electricity of IGCT just has stream or just bearing stream without stream, Ia or negative just having stream or just without stream, Ib
Bearing stream without stream, Ib or bearing without stream, Ic is just having stream or is just bearing stream without stream, Ic or bearing without 6 states of stream；Simultaneously by with electric current
The comparison of changing value threshold, acquisition Ia diminishes, Ia becomes big, Ib diminishes, Ib becomes big, Ic diminishes, the big 6 kinds of states of Ic changes；Wherein, Ia
For by the A phase currents of IGCT, Ib is the B phase currents by IGCT, Ic is the C phase currents by IGCT.
3. detection method as claimed in claim 2, it is characterised in that in step (3), judge the newest IGCT pair that need to be turned on
The direction answered does not have electric current, and the IGCT for needing to turn off then has stream, then it is assumed that pulse missing condition is set up, with reference to current inversion
The frequency of bridge, delay judgement go out current IGCT commutation failure caused by pulse missing.
4. detection method as claimed in claim 3, it is characterised in that in step (3), with reference to the frequency work model of inverter bridge
Enclose, calculate the pulse missing delay judgement time under current frequency, when pulse missing condition is set up, and elapsed time t prolongs
When, that is, think that pulse missing commutation failure occurs.
5. detection method as claimed in claim 3, it is characterised in that in step (4), if separate electricity corresponding to current IGCT
Rheology is small, while an other corresponding equidirectional electric current becomes big, and same corresponding with other one of corresponding separate electric current
Direction it is electric current and unchanged, then it is assumed that pulse missing condition, that is, turn off multiple gating condition and set up, with reference to the frequency work of inverter bridge
Make scope, the delay judgement time is led in the shut-off calculated under current frequency again, if the multiple gating condition of shut-off is set up, and elapsed time t
Delay, that is, think shut-off lead to commutation failure again.
A kind of 6. rapid detection system of current source type static frequency changer inverter bridge commutation failure, it is characterised in that including：
Pulse-triggered state recognition module, to lock phase rolling counters forward by real time contrast's IGBT group time and FPGA
Value, the triggering state of IGCT is obtained in real time, after obtaining triggering state, triggering state is recycled in the same direction, and then obtains
Take answering conducting state or answering off state for IGCT；
Current lead-through and variable condition detection module, to obtain the forward direction of each split-phase in the three-phase electricity by IGCT have stream,
It is positive to have stream, negative sense without stream, the state that electric current reduces, electric current increases without stream, negative sense；
Pulse missing commutation failure identification module, to answer conducting state by IGCT, judge that current IGCT is corresponding
Direction without stream, and there is stream in direction corresponding to two-phase in addition, and delay judgement goes out commutation failure；
Commutation failure identification module is led in shut-off again, and off state is answered to be in by IGCT, and corresponding to current IGCT
Separate electric current diminishes, while an other corresponding equidirectional electric current becomes big, and corresponding separate electric current is relative with other one
That answers is equidirectional electric current and unchanged, and delay judgement goes out commutation failure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710630146.8A CN107370407B (en) | 2017-07-28 | 2017-07-28 | Method and system for rapidly detecting commutation failure of inverter bridge of current source type static frequency converter |
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| CN201710630146.8A CN107370407B (en) | 2017-07-28 | 2017-07-28 | Method and system for rapidly detecting commutation failure of inverter bridge of current source type static frequency converter |
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| CN107370407B CN107370407B (en) | 2020-11-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942181A (en) * | 2018-01-04 | 2018-04-20 | 华南理工大学 | Commutation failure recognition methods, device, storage medium and computer equipment |
| CN108152680A (en) * | 2017-12-29 | 2018-06-12 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of method for detecting direct current transportation commutation failure |
| CN109995275A (en) * | 2019-03-14 | 2019-07-09 | 江苏方天电力技术有限公司 | A kind of current source type phase modifier variable frequency starting commutation advance angle Discrete control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203759149U (en) * | 2014-01-08 | 2014-08-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Apparatus for determining commutation failure of high-voltage DC transmission project |
-
2017
- 2017-07-28 CN CN201710630146.8A patent/CN107370407B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203759149U (en) * | 2014-01-08 | 2014-08-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Apparatus for determining commutation failure of high-voltage DC transmission project |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152680A (en) * | 2017-12-29 | 2018-06-12 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of method for detecting direct current transportation commutation failure |
| CN107942181A (en) * | 2018-01-04 | 2018-04-20 | 华南理工大学 | Commutation failure recognition methods, device, storage medium and computer equipment |
| CN109995275A (en) * | 2019-03-14 | 2019-07-09 | 江苏方天电力技术有限公司 | A kind of current source type phase modifier variable frequency starting commutation advance angle Discrete control method |
| CN109995275B (en) * | 2019-03-14 | 2022-06-10 | 江苏方天电力技术有限公司 | Current source phase modulator variable frequency starting phase change lead angle subsection control method |
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